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hydrogen ion

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Image
Published: 01 January 2000
Fig. 18 Activation polarization curve for the cathodic reaction of hydrogen ions and hydrogen gas More
Image
Published: 01 July 2000
Fig. 4.16 Estimation of E corr and I corr for iron at the indicated values of pH. Curves for hydrogen-ion reduction are based on experimental values of the polarization parameters governing the polarization curves. The anodic polarization curves for iron show a dependence on pH due More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910049
EISBN: 978-1-62708-250-1
... with a solution of its own ions at a 1 M concentration. The values determined under these specific conditions are used to generate the electromotive force series. The standard electrode potential for hydrogen ion reduction to hydrogen gas is defined as the 0.0 reference state by international convention...
Image
Published: 01 July 2000
Fig. 5.19 Potentiostatic polarization curve for pure chromium in hydrogen-saturated (deaerated) 1 N H 2 SO 4 at 25 °C. Dashed section is a cathodic “peak” where the hydrogen-ion reduction dominates over the passive chromium oxidation. Redrawn from Ref 9 More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910021
EISBN: 978-1-62708-250-1
... for indicating the inherent reactivity of metals. Most corrosion applications, however, deal with mixed reactions, that is, not only the reaction of the metal with its own ions but also the reaction of the metal with other species in the solution, such as hydrogen ions or oxygen. In Chapters 3 and 4 , various...
Image
Published: 01 July 2000
–200 mV (SHE) results from contribution to the current density due to hydrogen ion reduction resulting from the hydrolysis of the Fe 3+ and Fe 2+ ions. More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940087
EISBN: 978-1-62708-302-7
... , M i o , M where E ox,M , E′ M, M m+ , and E M, M m+ o are expressed in millivolts relative to the standard hydrogen electrode, mV (SHE), and i ox,M = oxidation or anodic current density, mA/m 2 i o,M = exchange current density...
Image
Published: 01 December 2008
Fig. 4 Reduction potential versus pH for iron and (a) oxygen gas reduction and (b) hydrogen ion reduction More
Image
Published: 01 July 2000
Fig. 5.13 Relative positions of anodic metal polarization curve, M, and sum cathodic curve, SC, for cathodic oxygen and hydrogen-ion polarization. pH = 1. P O 2 = 0.2 atm More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940183
EISBN: 978-1-62708-302-7
... by reference to Fig. 4.16 . There, the corrosion potential is represented as the intersection of the anodic Tafel curve and the cathodic polarization curve for hydrogen-ion reduction at several pH values. It is pointed out that careful measurements have shown that the anodic Tafel line shifts with pH ( Ref 6...
Image
Published: 01 July 2000
Fig. 6.4 Schematic experimental polarization curves (solid curves) assuming active-passive behavior for the individual metal-oxidation curve and Tafel behavior plus limiting diffusion for the individual dissolved-oxygen and hydrogen-ion reduction curves (dashed curves) More
Image
Published: 01 July 2000
Fig. 3.18 Illustration of the effect of exchange current density on the polarization curve for oxygen reduction in aerated environments of pH = 0.56 and PO 2 = 0.2 atm. Curves converge to the same diffusion limit and are identical when the hydrogen ion reduction is the dominant reaction. More
Image
Published: 01 July 2000
Fig. 6.5 Schematic experimental polarization curves (solid curves) assuming active-passive behavior for the individual metal-oxidation curve and Tafel behavior plus limiting diffusion for the individual hydrogen-ion reduction curve in deaerated aqueous solution (dashed curves) More
Image
Published: 01 July 2000
Fig. 5.17 Net polarization curves, N, resulting from the metal anodic curve, M, and the sum cathodic curve, SC, for the oxygen-reduction and hydrogen-ion-reduction curves. Curves M and SC are from Fig. 5.16 . pH = 1. P O 2 ≈ 0.05 atm More
Image
Published: 01 July 2000
Fig. 5.42 Approximate polarization curves for iron, nickel, chromium, and titanium in 1 N H 2 SO 4 . Approximate cathodic polarization curves for reduction of nitric acid, dissolved oxygen, and hydrogen ions. An explanation for predicting corrosion behavior based on intersection of anodic More
Image
Published: 01 July 2000
is increased by a factor of about 100 on increasing the concentration from 100 to 10,000 ppm. The increase in current density near –100 mV (SHE) is due to hydrogen ion reduction resulting from a decrease in pH due to Fe 3+ hydrolysis. More
Image
Published: 01 July 2000
Fig. 3.17 Theoretical and experimental polarization curves for reduction of oxygen (O 2 + 4H + + 4e → 2H 2 O), hydrogen ion (2H + + 2e → H 2 ), and water (2H 2 O + 2e → H 2 + OH – ) on platinum. Curve A, A′, A″: Theoretical curve for pH = 0.56, PO 2 = 0.2 atm; curve B, B′,B″: Experimental More
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.ssde.t52310011
EISBN: 978-1-62708-286-0
... Reduction potential versus pH for iron and (a) oxygen gas reduction and (b) hydrogen ion reduction Figure 4(b) shows the condition in which corrosion under deaerated conditions (due to iron dissolution to Fe 2+ and hydrogen ion reduction) is possible as a gray shaded region. In Fig. 4(a) and (b...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940001
EISBN: 978-1-62708-302-7
... + + mOH − + m 2 H 2 at pH ≥ 7 Thus, the metal passes from the metallic state to ions of valence m in solution with the evolution of hydrogen. The reaction is considered to be directly with hydrogen ions in acid solution and progressively with water molecules as the pH...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.9781627083027
EISBN: 978-1-62708-302-7